/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineFriendsInterface.h
Get the list of blocked players
true if blocked players list was found for the given user
bool GetBlockedPlayers ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UserId, [TArray](API\Runtime\Core\Containers\TArray)< [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FOnlineBlockedPlayer](API\Plugins\OnlineSubsystem\FOnlineBlockedPlayer) > > & OutBlockedPlayers )